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Assuming that I am in the office at the time it occurs, I'll post again once I've heard this is resolved.
To set reasonable expectations I typically wait at least four hours after I have heard from engineering that an issue is resolved before I am willing to say it's fixed in front of thousands of folks. ;) So, quite often, someone in this forum will notice that an issue has been resolved before I ever post to say so.
From what I'm seeing on my end, I believe the issue to be partially corrected. I can define an area to advertise in, but when I save I get the error. I then refresh, like it says for me to do, and then it seems to act like the changes made it through.
Based on the numbers I'm seeing, something is still wrong, even though it shows that we're advertising in the defined area. The numbers act as if the changes to the broadcast area haven't been enacted even though the account shows the broadcast area as being enabled.
In any case, I have understood this issue to be fully resolved. If, after rebooting and going to AdWords from a fresh login page (as opposed to getting there from a bookmark) you still experience this, I would probably suggest contacting AdWords support with the details and ask them to take a look.
As an aside (and'data point') this issue caused a fuss in another forum on which I post - and I've heard of no further problems there since the 'fix'.